SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0e9086aa3fbb4a088db9d092d30f4c5831990f67b219da4f8df2ece58fcdd85' 
  AND token = '96EFXTBNVsrCxbWlnZ2/Sm76Zgl4qWo1Usc5pteGKFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}